H&M wants us to guess who the next designer collaboration will be with!
they've posted some videos on youtube and there's lots of speculation already.
Some say Tomas Maier, others say Carolina Herrera, some say Lanvin
I say Lanvin!! I think they've just tried to trick us by using different people in the ads, but if you listen closely (and if you compare to interviews online) it very much sounds like Alber Elbaz in all the different videos (all of them being altered to sound like different people)

Does each H&M carry an individualized assortment of pieces? Like, should I try to find out ahead of time which pieces from the collection will be sold in the Michigan Ave store vs. the State Street store?

I'm not too sure about Lanvin, before these videos were relased the rumor was Shiatzy Chen..yes the voice is similar, but it's seems too good to be true. Also, would Lanvin need a viral campaign, don't the name speaks for itself..I think a less known name fits a viral campain better..but I might be wrong.